If you’re handling an estate for someone who lived in Idaho, you might wonder whether you need to file an estate tax return. The short answer: Idaho does not have a state-level estate tax. That means there’s no Idaho estate tax filing requirement no forms to submit to the state, no deadlines to meet with the Idaho State Tax Commission, and no state tax due based on the value of the estate.

What does “Idaho estate tax filing requirements” actually mean?

The phrase refers to any legal or administrative steps needed to report and pay taxes on a deceased person’s assets to the state of Idaho. But since Idaho repealed its estate tax in 2005 and has not reinstated it, there are no current filing requirements for state estate tax. This is different from federal estate tax rules, which still apply to very large estates (over $13.61 million in 2024), but those returns go to the IRS not Idaho.

When would someone search for Idaho estate tax filing requirements?

People usually look this up after a loved one dies and they’re stepping into the role of executor or personal representative. They’re trying to figure out what tax paperwork is due, and whether Idaho adds another layer of compliance. For example, if someone died in Boise leaving behind a $2 million home, $300,000 in retirement accounts, and $150,000 in bank accounts, the executor doesn’t need to file an estate tax return with Idaho even though the total exceeds typical probate thresholds. What is required, however, may include filing a final individual income tax return if the decedent had income in the year they died.

Common mistakes people make

  • Assuming Idaho requires an estate tax return because other states do it doesn’t.
  • Mixing up estate tax with inheritance tax (Idaho has neither).
  • Confusing estate tax requirements with probate court filings, which are separate and often necessary regardless of tax status.
  • Filing unnecessary forms with the Idaho State Tax Commission, wasting time and creating confusion.

What do you need to file in Idaho after someone dies?

While there’s no estate tax to report, other tax-related tasks may apply:

  • A final Idaho individual income tax return (Form 40) if the person earned income before death.
  • Federal Form 706 (U.S. Estate Tax Return) only if the gross estate exceeds the federal exemption but that’s filed with the IRS, not Idaho.
  • Any required probate documents with the county court, especially if assets are titled solely in the decedent’s name.

You’ll also want to review the list of tax forms used during estate settlement to confirm which ones apply to your specific situation.

Practical tip: Focus on what’s actually due

Before spending time searching for Idaho estate tax forms or calling the state tax office about filing deadlines, confirm whether any tax return is needed at all. In most Idaho estates even moderately sized ones the answer is no for estate tax. Instead, prioritize gathering asset records, notifying financial institutions, and determining whether probate is required. If the estate includes income-producing assets like rental property or dividends paid after death, you may need to file a fiduciary income tax return (Form 40F) but that’s separate from estate tax.

For step-by-step help sorting through what applies, use our Idaho-specific tax compliance checklist, which clearly marks off items that are required versus optional or not applicable.

Next step: Download and walk through the Idaho estate tax filing requirements tax compliance checklist. It lists every potential filing obligation and explicitly notes where Idaho law says “no filing required.”